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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e1a26b30d0f3597aad6a5e34717f773417b7583412970a056dac5f91648a2c' 
  AND token = '/cB9RKJ2iLkPdAzpfdTevhVCM0kssCLh6vesKC3lZvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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