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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43c330582435ffa1b9da2a67646f907467301a908edaf1354c47b2be9d1ac251' 
  AND token = 'Mrqxj2ww5ioYPMrYVCFswjaAvw3+ROwYRJaa1yug4ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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