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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae332489471abe00b8be4fe2e61d182223c2a752d2285fe38a734e22ceae24f' 
  AND token = 'b+HiOfAPV6YmIXGRAJocgTNKTe5wg1/L8sJ2EAZI5BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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