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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6a1d41437b10b54ba8f615a205a7ae170f86f2179d8c839a3f8a8d3429772b' 
  AND token = '8sn6K6I11d4ZRQo3imdq4u3rE0+bCWm7TNE1hW6MKHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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