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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60e7983d5e70fc10884dc0109ee45a52e2c1b738d5d15eda2c2db03686830e2' 
  AND token = 'Sr3iMnMUlNUAvppaTPYh9ba0ZXM5ylUKovFNzagYXMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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