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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8ff2cd5ea8f0cc4d679c56655a7c3a903767cfcb45d83e6b5822556c0c13e6' 
  AND token = 'rrt92u9p2OYOsujW7r5pIobzJ2NFse+Fcj2blCTOkZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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