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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e5f0fb0e7c248bf73046b2e9918844d2e44b38406a7c026f5ebf7b82bde34f' 
  AND token = 'IINWewZy3jXqZW5BUcJ/97aVH+O47Z1D11ty14x95/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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