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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24966252c5d5e3f18db991966223c1be36c8c198c7d48ba21f8b739c25a2f20' 
  AND token = 'B1KkaXOBZkwFI84k0j17TTtZd3MFN5qqkI0Ki37KqdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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