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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba0610c9469f8959ce93c723370481804d1e31ba6dfe2c8216cde119481b2c4' 
  AND token = 'q99tuRF0fosb2wZvJE4UUeT+2yBmyrUrJHNBHgVQiXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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