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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8a0857270ff33c6d54b1f47dd6cad08bc52736ea798572e27940c00d3e0f8ec' 
  AND token = 'mcd0AYbOr395KSIUUGkEv92RSbaQ+aCyjUnVLgq43hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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