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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17651c7aae1043fc4f28dbc960d8091185a3b5afbf9f6cf7ad2a353e56f357c6' 
  AND token = 'UXV3mnOCx0WWgCAoCWE2a9u3VpJlOQfqikviSHLlLWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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