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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e9b7eff2bd9d064fdd4a88268951e93afa465ed1d8d6d50e3db3e55b4e52e2' 
  AND token = 'HkRbM0bv1zXVJT6LzC7I4ZvzGuQ70z2A71LF1AEdwOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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