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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f00570908944c7bd40448d72307ac8e0fece57fecfbbe9846b0c4ea23cbfd71' 
  AND token = '/DF04rf3vuRryocQfCYp8ArmZ5b9maWj+UtxvzPny+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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