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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34e17e8a01e25760b54c7370fb70cdb0cd4e738393168210c7bc2911bc32d11' 
  AND token = 'FOCw3ma2/Eb/DJ6dAnDhsHwDY+VCbEl4HX7Eew4YfP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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