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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82702fe25ee66a3f2f5a08cd4806112665473385491f047350ae3d5bb437c823' 
  AND token = 'F+HpxUYTQXDeeMkPVlNAd00q1ULzwSWi4jSLPdA7g34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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