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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab6537f78a2f6e0bf821ce0df445bcb0716025fee6bcbec690444e56ae63e23' 
  AND token = 'S+qeQbbL9oC2megTZq9qJszikPH2PFQwLGGaIO0MAfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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