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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5689c6e3a460248aff22723fa8c825565852da1b15f40eb0b4b3b1c9743ee608' 
  AND token = '8BFhQi1i5UGJ8knL5hr/b83hN6erpXxCrKtsxfa+ahw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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