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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e20c94244711e471375cd01e10e6de37745e2d0b8130dec866daf93c7ed2a8' 
  AND token = '5ktTEVTUXDDqi2GFqKlOB7zDYY02mVaP06TU22AkcE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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