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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d99a961ed236deae0c33335908b1901e61e386f37bb7806382e99c65df28b5' 
  AND token = 'jUAMhzjl+L1Rt2vCts7rywV9xxwXSzK0ne6CYSzQI1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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