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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d4f87b659de2132750197fa9fb4487f60b1588ce5904e50f67c0997059ac2d3' 
  AND token = 'hN1dvEhtuyr8jbnio5jiuqjK6yMYowot4urxKzWL+JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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