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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8463a47818c07a60e70d0d5179f0cc7ef7339a19b2923174426db307d9e3cb5' 
  AND token = '9L3ed6Ot3I02a/C0AtKbCiMC6+CBZ/zEsTLHpibinlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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