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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5f08e734011f54f16538775af6e7cea5e96ea3de822059d61ce13d95a4d81c' 
  AND token = 'iZ8xwA4fsckx5wjFadUJjxiYF2QE2I3Ryeusvixl+9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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