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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9ad25a2c30d95dcc457f06ee5eed8f92dce9228c05deb2411a385f52613ad8' 
  AND token = 'kSV5pCWBG31sES/wFX68A/cl728AXzz2ygDP6QFHiLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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