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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f814637490b6d26d0a7eff46d0864730f4284478f43b664a44ff9fddb6cc9d83' 
  AND token = '1kLR2Vxd9OIOhpoADyCoEy7GMqMYf0tMtTw5f7SMkmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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