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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '294a7657399d62d72175929646551d7d58d8283dcbaa7295a7ace90db8a3b838' 
  AND token = 'C7VpGcURE+tIvJ2zJn/MDtXgcCFFmzzTSlbedq3Txy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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