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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32cfaeeefd7c97c3c919c59564a89bdba20a174ddff5a31d5cfbab648a96b44f' 
  AND token = 'AgYaOrXYByOyMm80AuBFzrJ4lrIH3VFsiOOk3DxLr98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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