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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92e7a74ba4ae9c1d5150184c413bff96b4dfff579664167b0ae66f18331544e' 
  AND token = 'UE06iRw6vb5RGyGgmH8HMAgppf+v2UaDDunjIrsQEUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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