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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f034a0130e0967a94b20018896f1a8fec0a787288fe1a208d5017a6ec2938d4' 
  AND token = 'j42uz3cUOvhSISajUhRlDGBMRA564Ipnidjt2pbC/nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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