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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '660d6cb4065204f443f2ef50b8c598b083d5a7646ab7eac8a41b11a523da1bdb' 
  AND token = 'VoyGcbxR7VAw6FT2ItjXyXM6h2PE+rIIhCYLxReKTP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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