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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da9daac17b05b0bd2a45b57d644c218ef874d7f3d9a67190018dcee3042a68e' 
  AND token = '5BBWjynIue59NBJ/bi20Ra03FpwTPm0yVB454a7P1ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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