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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9da1b5bb1b866ceb9bdd4bcd61c0ad679adb60f8fb204a0ac64529c7a92cea0' 
  AND token = '5tvIH0ggoixzAY9ElfThGOtxtrfLbX1pEMdSZmlMYUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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