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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96eeb106e7e9f3ec9320f8dae7e928823577363372c5deab4248986ac93ee9f' 
  AND token = 'piCBjxS8tSNOxlgDtzBp0z62Sa0BHWduJqqcAn4JjB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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