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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0b09c5856afdf060b73eefbe37d973f8197e34980eff4eac27b8fbc24525894' 
  AND token = 'le/tjKYRmpwsHr3TPA418cu4Sz9kNpKNAvwO86xVr0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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