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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b137e1237f4760348bd47ec9a35ee06f62fbc75a4bb55ba42a32ba16b3fdc865' 
  AND token = 'o3UcPHWvftmQWs8K2WLw/78G/aQzm6hOCGg3SHVxO1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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