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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74702a84cf3c4f0b5e9c6e5d0952f01756b27d0eedc9f6e951b7dfa0cf7bee4' 
  AND token = 'Vjd04exNb3H07zS+W3EfuO1ZKUk+nQdxS9aUOSi0chY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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