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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b5d4218aa3b3b3c17f7b733bd09d1128c6286430ea9f7bfa6abfdaed09ddc2e' 
  AND token = 'qmBTOcQltC2n3u/2tLKFMZsTMdEs4pnlQWwZb88ACU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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