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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb4daea1c6987d13b5693e00a0ce8359458148459d5b50580033840f1cdac70' 
  AND token = 'T58IeUXD/kSNnWgHpXspOqJ81nL5mvgy+722MbOOcsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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