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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd56ca7e4d99c80d635b3e73b490db3157657b533397bc5861bd754dfc8ffcd1' 
  AND token = 'zO0Uv+5xAD7K0GUkErHDLVaaCm8lGCp4GDqph+SXGjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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