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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea3aabb69b0bf5182349a7eee87f42c0a043ffa20a837a3f7c6eeba63353145' 
  AND token = 'V/7Rk3c6/XY7JAakG1Bfq/o3jEgFsao9xpl6ck7dxR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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