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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04fb1697f98ba1b3fc32d25a8e316673944d00cfb8a1d0552ad73891a2e8ed78' 
  AND token = 'd9arv2xcSM7odIW3OQeyyrcTBzwpPTbGHIIdeleJo1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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