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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6942916374a8e1652294d0e00f7b88f41b3f15d49dbaec1cd5c9e400e6d9990a' 
  AND token = '1OHPhTxPaz0aNh86kCLax9QhRixDV7Qwuqi1H33CcIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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