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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0894cb880a0724f6534436633d3bd3329033b4ebad9c7bdda7647b754197ea04' 
  AND token = '74wpz1gatGl9ziY0+Si7iPijDRgX4emNqa/K5YUw//Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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