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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27785a4db5388d16351bc1579d863f3c0703d88af01dc3f40a534be84e66a4f5' 
  AND token = '0ekVoM3tC76UEBIcKMoTkPOAZ/XjNGB8JlAVmFZV6PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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