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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f18a98b2ff7afba73d99cd38cd9f748bf896a5e9aa2d0b2c8f8f12661ba572ff' 
  AND token = '1HuVn1titZLAEoo1ZemfnB/or4Vg8pf09+w2Ln8X3U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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