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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52695e9e90bef7c44605b64447db595e5dfe770320e47801834162feaebd9d76' 
  AND token = 'QN81SJfAlLQqp8kv1usw6uhQ0Lip1BrBHl/cxFW7zHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}