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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a6bc612c2a383fb75dcb49efc0c8b797ef0a0080a92ca6b85c67d43af48e877' 
  AND token = 'eOSdWi9Qvbhz/xn28RbAyQH0I0YQ88+MsEtbDYy/Xxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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