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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac82aa7ca61432179fb85935ca133c25da69f27a5f9914f9b9dde4f4545c115' 
  AND token = 'xmKkjj9i0s9FWZ9d3YwugkJ4wI3LG20YF4snqCOgffM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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