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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b55afa6720204147460dd15e7d67b1b1b05a0f6c67431d45d7f0791f16e7f6' 
  AND token = 'hypvGNV1zAHV/aiD6Hhh2c9h454U1goa5JmpA5lA0BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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