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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9143274b5ae120eb73aa6faf6519301ea0eee02a5ed3dddbb987633f2fe4bdbb' 
  AND token = '7C03PuuNTHF+MHDe0s4OVzbmCSINQuSX7O1ejP42Gf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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