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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abeb376120233636724caf2cb8615a859890bcfac231b20632b4604e122e2758' 
  AND token = 'r4Z5swjc4M/nLdbQL5ig85UMa2p+T5wXW8O/1KCGkBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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