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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2819aa510c410c6256ed6a509ac5a570deec074a6ccbf1028c4bd4ab3552b02' 
  AND token = '4HaLZDhtkAGjm8uzB+Bvw72ty9qHCOdR0KZvA8RmVsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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