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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a7ba5e12be601d655bbd1bc928a213b2fd0c04d632c649fe96a961b1413901d' 
  AND token = 'nNU03HUco3r6ncC/ccao86iJLzqyODhT9Lm93M+0Zv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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