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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec855995426fa95caad5ad38285e7c284ca73e7295904ecae1b8681aad8623c4' 
  AND token = 'K0Vyvp64Jl+nV4mB9LI090YcAoaU8WdyUcv7jpYhS+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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