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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb8211d450221316eb787d586a6c23526ae5632ba8d6d090e2df6300df21f19' 
  AND token = 'dDmJdYbP8dXIWxF1j94Y3xNFhgho0ucf11j/YrmlyM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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