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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec51b2104ecc7a0e01d15479ed83b034ee41b8ed89781f7238d7d2ecbacc86a' 
  AND token = '6LGdrhC0oQhhCHHwdoLxiicHCScMyp34g6Hjp/8Zzlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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