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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cf69e7e3616318f55c1c2c995ee8bdabd0775820bac04f68938ac0aa758ef37' 
  AND token = 'NqaqWgx02U21cXt6BqlpynRwbyki8L6DOiv1TRvE8SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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