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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28cd03b64d5c6b6884cbb3d4f9c0b0e6ccd90935962bec3db869d0e3a00d4d00' 
  AND token = 'jlLPpTovyAyxvo9AnpJn3s3uiJf8wAA8qrV6oyZaQXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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