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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d5482a691d421913882d4d8a6c122b0e93c4812210b48befcfbb8207684cf2' 
  AND token = 'q8kWFllaneEoL4VQHYmzKf0UKjtws1wvtW6G8z4gGIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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