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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056e4bcb1bd4c01462cc870db0d2ff2bac236823c1b5432d35e29cb15fbebfd5' 
  AND token = 'Ph+VamPhLmcRxKDsGfEM2kKDVWLZQwW8i8sSbNzbylg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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