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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ef5d979d73599364617223a235205cd4f5f5dcf8f260188ba78dc2d43d5583' 
  AND token = 'kJJKAb5R0tCsMRLNf/NpJpi5bbPqwRyVU0Q1y/f/Fro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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