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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f079a1d2526bed2af4da6f828a406611cf94ff35dc32a3d765d246094f81e87f' 
  AND token = 'j+t7Su5g0CvxhHK4cj61uGmd+8xYISve1IcRTSYAlYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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