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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82495bd1dc7c55bb82aa929300be80e62be93806d3a9bb9c122c694ee7929bc6' 
  AND token = 'GEByO5SauriojVyzbrWyGC4m2Lg/xGmAX12+CjFT6nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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