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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1137c22d69311771283ce0df0f589c92f07df7453c27512ec6779cc68901b5' 
  AND token = '9KE6NPYJzPIfuYpCivrSOlUFbExoHVmP56GEajK4dL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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