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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cafd395073db14eadbe8310d4d62d5a7d4adc31dc338aec3642da516b063680a' 
  AND token = 'ZSoRM/59tMIMXmLtW9guf8M0ZIGrDRlbwxq+rHXVpQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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