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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c5c3061bf7656b79a6c77f1f1ca1b499376d4eb487d52ab4e62da06b14ebfb' 
  AND token = '42kCTAUGw3C999qMzUX4X/WIriF3zV5bVoI62S2LE6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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