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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d4680c7da4a22d7344b6db05e66b8f86893a658366bfca85ead0236faf55ca' 
  AND token = '6hNWKxZ0Aaq7Wm2JZWAfk5ePNAP9wApQjLVXZWtFoCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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